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Incorrect size and checksum reported

From: Douglas Concors
Subject: Incorrect size and checksum reported
Date: Tue, 16 Oct 2012 04:33:31 -0700

When I run gzip 1.5 with the flag -lv, it blindly reads the last 8
bytes of a file and assumes the values are the checksum and length of
the uncompressed data, however the file may have trailing data after
the compressed stream or may not be a gzip stream at all. I would
recommend parsing the file to find the end of the compressed stream
and reading the checksum/size data from there.

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